I am getting a bad o2 sensor code from auto zone P1133 and have replaced it 2x on 2008 Chevrolet Avalanche

The code according to the Tech's at auto zone said I needed to replace the o2 sensor, bank 1 sensor 1. I have done this 2 times and they cannot clear the code. My truck is still getting terrible gas mileage and doesn't seem to have the same power it had before this problem. I also changed the spark plugs on bank 1. What is going on what am I missing?

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